SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ee54e38577a88c39669b04c601f0cfa5be6aafdaa16a02bbb0291a23ddf7e7' 
  AND token = '95Q/dv3Q/f3jvqeDxxKDdjIVqpdLwm24y9nXJJpqXgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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