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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '031aeed5296c7d7d274b424ac71851bf8b442d14c8f045c85a78e01ca52f2673' 
  AND token = '/IEdTHgoDIkG8l1vOxKmPl8SlrLIa2P0lcRcGidmZ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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