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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db3fd2e82caa21f08aee72fd420116fa18eafd50131f4e5e5adc123ff2af03ba' 
  AND token = 'N4LhIYIBUaojq5WJP4YvtfuPqj767Yp1bTdCjYpO8tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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