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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e3e9ff1ed32126c8d06de03e30362ca0fe141fc14028ee4c43068cc014bd7e' 
  AND token = 'fJbbCt8seswj/CMEoFmzqayG7js20/9sI3kdvG5O9tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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