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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caec53d58a16746d2c84b1b843236d0e6e458ed168c4aebc566711dd109c10c1' 
  AND token = '2jEvI2q5Z+VwAKzhPTTXxlVjhrtAn+/A80zoZxEF6c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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