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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaa197b92149cd081e3a6e1daca7bb72037e681ed899282e429d0e8de6b1584e' 
  AND token = 'I+iTEZGFK4R8xTRTgEBrUkqrIt4bfBwfUIAsvqC0Q34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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