SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba266d6d0fad58f4016d977fd5627d40377e4985a8b0e145ea6e0f06638d8bad' 
  AND token = 'y8gtBxumJfCM4O+x/4lNlZLmzFuEiQhVwJQju954Bkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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