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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf12f4d4a0b0dd0c537cb6c4438247733a2dce573677201c45f3fba3cceda16e' 
  AND token = '8XLaH2w2PJ+RxKveSrJBVJqNTvMnNro+/NW+T4kox84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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