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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '730786f28a78aa5ea31d5fae0dd215458044dc11f69a46cdf2ac01b7150e7f09' 
  AND token = 'DOlFp3dRZ1eqKazEPWo0SZdDmBe8Do4u8epXqn8oT9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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