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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0338b0bd389de4afe18d0eb747af3fc25ba9afe70b632bcfde3b2a9b45235f41' 
  AND token = '1sYNjPceoN0JzYFp+2X+jN1FU0iEswaUiPNlma3dDCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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