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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3832579729f58fe80a31b3b95540cd87c75a3898a882b05f2a598ba7988ca1bb' 
  AND token = 'pNab6A3NQzN0MAIV+wMtm+sWPwnUEjlLwz6bSmazQ80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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