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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3abf3b1cd4e0a51afdf35c36516937f61d980c097b78ad5b17040177fe1eba1b' 
  AND token = 'k1Sq7MOAr3FfWucWYgFD7XvDcrchHT9ZwYtcjlBWvX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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