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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b252b6160aa960e436b471a9f5fb4c542ff34dc1fe9d833d230f76a4e1040f0' 
  AND token = '2E0e73E5iONyjeT/9kt49bE7JLuY5lCKF1395Wn5Lss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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