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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '490f1c5896eaa47ead28512f28f378881e583f10b194403bb0a1a8f4077a9d12' 
  AND token = 'Viw+nNvu6vwfYUi+A+aZdppq6kMO0IIbaXDJlfJATCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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