SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '915f8db1ac4db1826217fe5dedf54aff8cd8f710f133632aa1ddd5db2087f84d' 
  AND token = 'NG9mJHKLRLwF7YwBqlhr/kc1oixz0+ifKHv4InbTquY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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