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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1be0875bcb6ce1deeb9b5c91d438d2cd4bf7b3b958814ca4dec2e87d8a24bc4e' 
  AND token = 'oxmcN9bpnwlAq/eGhgoAlBYhfa5AQRaJjyjp3S0fvSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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