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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30e087ceb55c9d64f5e7c88b296557a6ad4136085fe248f6cb31081200c2e0a6' 
  AND token = '4NX/1Lrwj5li0ZmsbtvZVA0T4OPKAVro4/XODN8vMZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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