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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfe34381e82bb51b51b710ac08609ebae47ea2d6d95c59ccfccaac1fa160715a' 
  AND token = 'GHgNHLwdxvo7YhcmaVQdTDXGI7KQxd5DlY+Y2yLK0AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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