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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '949cbdffe833dac04e9380ff0e5a51b5869503847daa0b308bf25a6c28cd463e' 
  AND token = 'TVE9Y+Iy1KPHifxQgTUJyNJRb/U35UHEXjFXzAHgyl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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