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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4b5f5af693eaa8f5298dd4ccc5ec51965d826611d4229575339f12d06be212f' 
  AND token = 'WPhORl8nMTvFqYxSibcLGEc12d8fl7l/zd8ybRelNSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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