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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7bbf43a0857b8caee5cc1dc1cdd8baa874dc8c8ebfbabf91d4bd4ced0ccaa2f' 
  AND token = 'MIAkg8GJFhwyTodt0qof8xZ6qOxeEzdHoXsTJVrkWoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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