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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4edd20bb8a7b2aebda80ad60835877b95c75c98502ff27594a4d2b159f60b2e' 
  AND token = 'tClRaJZMWrkQ0LkwhBX1h3kKUZQhHKvyQk1DkRdzDZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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