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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a869d4b5aa8cc04d37d0358cb0cbde1a2353aa6cd46d7a0c5cb5ecbf71f49b94' 
  AND token = '6uTbRp3nZ6woL3eP1nYU3W7UgCt/NpfDE8xHWlNJ1V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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