SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac4f6046c8c32587bc5f0b53127a1c83e13113502ee4fb66745a7ec6ff439062' 
  AND token = 'ZX8YER/Xy+gMteQwbA9qd57VL40quNIyeVSuWzhH6hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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