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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76ded52d2dff03b4a713002f8db28ebf0c565153ee390553d66f368b73bebc2f' 
  AND token = '1C2y2PmcM/k6ytCYstb/nf3VFthpsAGWcKrQBdrJ9bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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