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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0293c249e93f94b83ce2a71dbe204f752e7baea8a4987a947465ea74afe033a6' 
  AND token = 'O44a2jggRcTKEGGPtM26S7UqJf51ADJKYqo0o8pPGsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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