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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9e5466d57404eb7186d067df65d8e25361fe549f9cf149bec34b998dcf0ec78' 
  AND token = '8QcJHTiBA7G8qj66EQwu7/u2zFZ7Nx8iIeioiV5LFQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}