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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11b66bb3d5db48d4f49ee4e0bb3ef0bb4de5ec078c3e023582eedf2aabfe4966' 
  AND token = 'Jm/uen1vjVps0KqVczey7kfzfCyfxA5i51Aogobi8fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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