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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb7c82100e5446df9a2150d2f1701d2712bef9afac1f8a618844e58f61a98f75' 
  AND token = 'VTmR7rU/1Ugl16rpQ2zqp/T6uU3ifZffgNRPS5NSrHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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