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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6292bf09786dcdfd7754032cafbf8fa84591acd7136e24160491295801b5bd0' 
  AND token = '8uaFkn3PfbXPx5WL4as5Ote1ClXLSwR6nTTUcKpA32Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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