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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61a06ca29ad384d92be998c7d1c3fb1fd4c2bec490665115779f08eabbc3ff8a' 
  AND token = 'neYD1ot6OlNz8eXV3y7N33IZ9LHB8JSWVnO6ZjA1D+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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