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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '769aaadde5afaeb03c3773c75ce2469434c5afd4b57a11ce09f99f7cdc068547' 
  AND token = '9DCB42ewXsIREH+FkQlukXVrcyC4yl96YCqhR9kYXtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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