SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b57f1c202f1aee078d03497cd4b6a51da4ff6546d1dcfe893be662dc6f98299d' 
  AND token = '5nbNtlpxz8S/XTu+MMx9/hmgng34S4UAGyEBFK3kCdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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