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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de359faab621b55d2393337ac3eca9b333903afc722b4c96da86e7337cdd85c8' 
  AND token = 'kGgJrjsCSdQpFhpfDpVHpTiu8hKTbiK8N/EOPIdR8K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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