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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6fdaa079650e05914e3ce2eb82a9f9a0cc4a37a1497cb207628483454cd30a9' 
  AND token = 'Ejoe28s+rMn7RJScZfaYlY5xIurik4Euc8htIYr/buQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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