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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '698009391a1d6e76d46b9bad3ae83b41d6ea7d97fb1410462c5911fec82a1d78' 
  AND token = 'Jpf0E+oXsz9vku05JrgcWpIYPG0OsbEMD7h1fLPhpa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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