SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ca9bc8c8cd6a3f24c84f94a969350fae30ed3285139326518927c524b190c23' 
  AND token = 'Pr1eUc+yC4HLuzBg0rTtVkKhQhqhs1QkIRQOtBwb69A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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