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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9598db0501cd11d3695c5ba71389dad4595c994dc8594d4e191dca8e79f4c203' 
  AND token = 'EJPNvfc3UVfFFHUiHfiX9WKm8cvOpUc6GsOm4m2PD9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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