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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '721e68def24f4ea0e37ad6b145451d349fde172cb772c94c8d18ff3084090472' 
  AND token = 'qP2HrP7VIQxgdsNTKF9rwnpB3ilwo4WDd8uVQ8oQH7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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