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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e0a6d410b76f5db89737c6742503985393e013e40e48d1102ce01425e8ff9ad' 
  AND token = 'vLb9JUdIHag30s/vKs+9PA0dyN6cU+0Y9K2ZNvmSXus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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