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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fce9fe22bbe0c5337663bb4351bcfe1e04000ffc55cf289bb8e2976313b1dee' 
  AND token = 'xwnBPVXZLQr3/9GrJd8LNXoX2Szj1jyEVKxQPoNnncU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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