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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00e28fd99308eba0439c6cdaae1eb2ea4ac91a0491b756c33ed9bb5e651573bc' 
  AND token = 'IWMfza0GsloFQNfI/yvmA55tGOBYWC3RRQGSMQQ8Ekc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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