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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07eb9fbd70b2619d299b3e43ea75c570f34d4ee5b0c9930c242c9deed4b04419' 
  AND token = '5wYpq8VhLhxiWALBW4yi+/mxVNDyLV4EjrAjClUnqV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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