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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '863d5f4db25330f0444071984ce48a16c08e343806e1aac7f92bd5a320dcca7e' 
  AND token = 'XBmW2wrBM8v02Trw3MPG3iHMVj3l+XKL5aMIc7BqLFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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