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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f1348f9e501e7a18a9dd0af9bafef5ffcae0c1e48c14e2e6cbba4eeb9b734f5' 
  AND token = 'p1DMpkCHDPUe7NaN7r5L72N4MIVJXX6YiqebPQHnGPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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