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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2852eb65c1e866604e01cecff643ef61c56db09926e159e46ead6b91826bda45' 
  AND token = 'syGR9KOsIJVoMqilSWU29oU04tgb94f6aalv8K+AuvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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