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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a18a8d32c8ed8a1f8ea6d8a4303af45f96a5e585a59193f0acf8ef93257062e' 
  AND token = 'Pn9Yb3FAzx+Sl9pQw1LEZgmKVlOfz+/boweEHkzzBW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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