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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5a889ae089cada28a0bbfbc4f2e1420fbb38e99c851a4c5f70e2df506e77562' 
  AND token = 'pci4Ms2A5xcukP8H5zebvJGBOZEmQEBHcCefxZ5OAJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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