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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b27e564f133454fce5d71f12b6d60b58ec142cc631157f0581a265f45dd2d0a' 
  AND token = 'Mg0weTDQWI9Ch+4rvC2YMG1ESyw4biDZWwcPzNX5Z+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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