SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77782f8c023f3e52904d90281dc5db304fb2b673766568c3cd68e8a3d6fd302b' 
  AND token = 'kF1vjKHMg7FaGs/4BNwEdIqip8KsNKT795Z1BM009OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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