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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84df30b84c84c8905137b06a178a7c7a28ab95c36a6df5078e605b43af81a2ff' 
  AND token = 'IJ0Jxaf8PXGYy52FfJr2nCrH3VexeQjrhsCB3W/DHDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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