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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cde2b851252f55d20e7caf6bea9c7140801f4b4b45fccf9be1f02b85f8a9d4b4' 
  AND token = '+kuoC+ar3dsHucsSBSb3Fqbhz+oooxRvlD8qYk4TNak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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