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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6866750c0efbd2b8797ed4dcaa2cd2f6718e4eb4612ac9bc6f17ce67f47020ad' 
  AND token = 'OKlkjVZ0bkgyJZypkP7UUWlyhLmaR49TIiSKKnGpJuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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