SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6853d14f67726e8e039ed16f7286ebae380b55727d997bcbdcc0201401c492f3' 
  AND token = 'vIjLn/+IVSp404cmpRhqINoLJG0Z2SvJWOyPtgDb0MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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