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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a028e9bfba6d952e407c4571450dcccde0711d518342a2e5b1e4599e33c80ffe' 
  AND token = 'HPsSsfe37PMQrgO0nRuYgLElncrXqHE1YgWqkim4zX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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