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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fbcc1f17d4fea0747254006442f8e83c8a68e5695d2989071590762bf5ee683' 
  AND token = 'wRTbA2j4P2+VckqvtFbRR7qN9T2f/JDeKEFNyd0hWME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00224

JSON explain

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