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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b04ed976835a71f42652397dee10344225813ad5b577b1bf113bb92de5d2fd5f' 
  AND token = 'Jx6xocvipzSDpXzX+9OMZySo1l8IqiNC9M4AQ08NYlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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