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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d4f3d4feb28cd120a138599833d6a0363cefd807749a902e6f2a62958dc635a' 
  AND token = 'fO0naf05YejAbYNYo7M+XE2bfvEmdfMfJ9ojyXeiq+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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