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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e859c9bee6112a803b4f67bd0496afda9cd7ff0c6b931539734a3d0dcdf60e85' 
  AND token = 'seg3Lfgdd46JR5yd6QECNVHuqk3NbE7Utv2u/+FuHmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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