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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b3e854b424f0a5244eeffcf3051119c394840d91b99bdb245f5afc688ce63a7' 
  AND token = 'WP6Abu78FhZuOBH8/34NokFmhjTodp9B0NGPcRA6Yh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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