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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13d49de7443288283b29115b9257cef8602820e638f026d1170c94e15211b2ad' 
  AND token = 'sCT4FUo8LY5bfMXzP9RlXrxW0f6nuf0hCY8QvF+wBeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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