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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7906e6f325202cdff32f726cc23da013edcc6a9d2948b9dd16efc3037705c15' 
  AND token = 'NM6FS5B77ADoHm3MZ6Qoq0uW/4CEjdXn1PGxtnyvI2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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