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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da9a7f056884bd758f0027eebf5053346b0ed21085a58f01f6cc2d2abd3b267b' 
  AND token = 'fUytoVPgGdo1RVqf5vA5y1phwdrWRn/pHSmK7i2+OCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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